Light coupling mechanism of quantum grid infrared photodetectors

J. Mao; Amlan Majumdar; K. K. Choi; D. C. Tsui; K. M. Leung; C. H. Lin; T. Tamir; G. A. Vawter

doi:10.1063/1.1445484

Light coupling mechanism of quantum grid infrared photodetectors

J. Mao, Amlan Majumdar, K. K. Choi, D. C. Tsui, K. M. Leung, C. H. Lin, T. Tamir, G. A. Vawter

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Abstract

Rigorous electromagnetic modeling based on a modal solution of the pertinent boundary-value problem was performed to study the light coupling mechanism in quantum grid infrared photodetectors with lamellar patterns. Our theory shows that vertical field component and absorption quantum efficiency η can be strongly enhanced by judiciously adjusting the width w of individual grid lines. This enhancement is further increased if the top of the grid lines is covered by metal, which behave as a collection of dipole scatterers. We have experimentally verified the dipole scattering characteristics with different w, and found that the variation of η agrees very well with the theory. We also found that, as expected, the conductivity of the metal strips affects η significantly due to internal dissipation.

Original language	English (US)
Pages (from-to)	868-870
Number of pages	3
Journal	Applied Physics Letters
Volume	80
Issue number	5
DOIs	https://doi.org/10.1063/1.1445484
State	Published - Feb 4 2002

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "Light coupling mechanism of quantum grid infrared photodetectors",

abstract = "Rigorous electromagnetic modeling based on a modal solution of the pertinent boundary-value problem was performed to study the light coupling mechanism in quantum grid infrared photodetectors with lamellar patterns. Our theory shows that vertical field component and absorption quantum efficiency η can be strongly enhanced by judiciously adjusting the width w of individual grid lines. This enhancement is further increased if the top of the grid lines is covered by metal, which behave as a collection of dipole scatterers. We have experimentally verified the dipole scattering characteristics with different w, and found that the variation of η agrees very well with the theory. We also found that, as expected, the conductivity of the metal strips affects η significantly due to internal dissipation.",

author = "J. Mao and Amlan Majumdar and Choi, {K. K.} and Tsui, {D. C.} and Leung, {K. M.} and Lin, {C. H.} and T. Tamir and Vawter, {G. A.}",

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T1 - Light coupling mechanism of quantum grid infrared photodetectors

AU - Mao, J.

AU - Majumdar, Amlan

AU - Choi, K. K.

AU - Tsui, D. C.

AU - Leung, K. M.

AU - Lin, C. H.

AU - Tamir, T.

AU - Vawter, G. A.

PY - 2002/2/4

Y1 - 2002/2/4

N2 - Rigorous electromagnetic modeling based on a modal solution of the pertinent boundary-value problem was performed to study the light coupling mechanism in quantum grid infrared photodetectors with lamellar patterns. Our theory shows that vertical field component and absorption quantum efficiency η can be strongly enhanced by judiciously adjusting the width w of individual grid lines. This enhancement is further increased if the top of the grid lines is covered by metal, which behave as a collection of dipole scatterers. We have experimentally verified the dipole scattering characteristics with different w, and found that the variation of η agrees very well with the theory. We also found that, as expected, the conductivity of the metal strips affects η significantly due to internal dissipation.

AB - Rigorous electromagnetic modeling based on a modal solution of the pertinent boundary-value problem was performed to study the light coupling mechanism in quantum grid infrared photodetectors with lamellar patterns. Our theory shows that vertical field component and absorption quantum efficiency η can be strongly enhanced by judiciously adjusting the width w of individual grid lines. This enhancement is further increased if the top of the grid lines is covered by metal, which behave as a collection of dipole scatterers. We have experimentally verified the dipole scattering characteristics with different w, and found that the variation of η agrees very well with the theory. We also found that, as expected, the conductivity of the metal strips affects η significantly due to internal dissipation.

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Light coupling mechanism of quantum grid infrared photodetectors

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